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When expressing "It takes about 1 hour and 15 minutes", would it be best to say
１時 means "one o'clock". １時間 means "one hour". So you have to say １時間１５分掛かる。 If you want to express the "about", you can say およそ１時間１５分掛かる。 or １時間１５分くらい掛かる。
Required, but never shown